[PATCH 5.10.y-cip 19/22] dmaengine: sh: rz-dmac: Add DMA clock handling


Lad Prabhakar
 

From: Biju Das <biju.das.jz@bp.renesas.com>

commit 161596fd776a54df922158175ed844804a861c37 upstream.

Currently, DMA clocks are turned on by the bootloader.
This patch adds support for DMA clock handling so that
the driver manages the DMA clocks.

Fixes: 5000d37042a6 ("dmaengine: sh: Add DMAC driver for RZ/G2L SoC")
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210923102451.11403-1-biju.das.jz@bp.renesas.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
drivers/dma/sh/rz-dmac.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)

diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c
index f9f30cbeccbe..d9f2cfef878e 100644
--- a/drivers/dma/sh/rz-dmac.c
+++ b/drivers/dma/sh/rz-dmac.c
@@ -18,6 +18,7 @@
#include <linux/of_dma.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <linux/spinlock.h>

@@ -872,6 +873,13 @@ static int rz_dmac_probe(struct platform_device *pdev)
/* Initialize the channels. */
INIT_LIST_HEAD(&dmac->engine.channels);

+ pm_runtime_enable(&pdev->dev);
+ ret = pm_runtime_resume_and_get(&pdev->dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "pm_runtime_resume_and_get failed\n");
+ goto err_pm_disable;
+ }
+
for (i = 0; i < dmac->n_channels; i++) {
ret = rz_dmac_chan_probe(dmac, &dmac->channels[i], i);
if (ret < 0)
@@ -925,6 +933,10 @@ static int rz_dmac_probe(struct platform_device *pdev)
channel->lmdesc.base_dma);
}

+ pm_runtime_put(&pdev->dev);
+err_pm_disable:
+ pm_runtime_disable(&pdev->dev);
+
return ret;
}

@@ -943,6 +955,8 @@ static int rz_dmac_remove(struct platform_device *pdev)
}
of_dma_controller_free(pdev->dev.of_node);
dma_async_device_unregister(&dmac->engine);
+ pm_runtime_put(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);

return 0;
}
--
2.17.1

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